用分光光度计法确定查干湖复杂光学特性水体悬浮颗粒物的光谱特性与吸光幅度, 在室内可控实验中利用定量滤膜技术对2009年7月15日和10月12日两期水体采集样品处理获得了以藻类色素颗粒和非色素颗粒(无机沉积物, 有机碎屑）两种光活性颗粒物质为主要贡献的总悬浮颗粒物吸收光谱, 结果显示7月份总悬浮颗粒物光谱吸收谱形在400～425 nm范围内呈非色素颗粒物特征, 在670～690 nm呈叶绿素及其附属色素特征。 10月份藻类色素颗粒的光谱吸收贡献在440 nm处显现出来。 两期数据总体表明非色素颗粒光谱吸收系数aNAP(440)与悬浮颗粒物浓度显著线性相关(R2达到0.929 2）; 藻类色素颗粒光谱比吸收系数a*ph(440)均值从0.145 m2·mg-1增加至0.229 m2·mg-1, a*ph(675)均值从0.084 m2·mg-1 降低至0.107 m2·mg-1, 以叶绿素a为主导的藻类色素颗粒光谱吸收系数aph(440)与aph(675)与叶绿素a浓度呈幂函数关系。

Spectral characteristics and the magnitudes of light absorption by suspended particulate matter were determined by spectrophotometry in this optically complex Lake Chagan waters for the purpose of surveying the natural variability of the absorption coefficients to parameterize the bio-optical models for converting satellite or in-situ water reflectance signatures into water quality information. Experiments were carried out on seasonal frozen Lake Chagan, one representative inland case-2 water body in Northeast of China. Particulate absorption properties analyzed using the field data on July 15th and October 12th 2009 were measured using the quantitative filter technique to produce absorption spectra containing several fractions that could be attributed to two main optical active constituents (OACs) phytoplankton pigments and non-algal particulates (mineral sediments, and organic detritus). Results suggested that the suspended particulate matter (SPM) concentration was higher while phytoplankton biomass (chlorophyll-a concentration) was lower in July and that in October. The spectral shape of total suspended particulate matter resembled that of non-algal particulates which contributed greater than phytoplankton in total particulate absorption during both periods. An obvious absorption peak occurring at around 440 nm exhibited an increase in phytoplankton contribution in October. Non-algal particulate absorption at 440 nm (aNAP(440)) had better correlation with total suspended particulate matter concentration than that with chlorophyll-a over the two periods.Light absorption by phytoplankton pigments in the Chagan lake region was generally lower than that of non-algal components. Chl.a dominating phytoplankton pigment composition functioned exponentially with its absorption coefficients at 440 and 675 nm specifically, the average values of which in July were 0.146 8 m2·mg-1 and 0.050 3 respectively while in October they were 0.153 3 and 0.013 2 m2·mg-1 varying regionally and seasonally due to the changes in specific composition, light and nutrient conditions.